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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3df218

Atomic numbers and configurations: Pu 94 ( $5 f^{6} 7 s^{2}$ ), Am 95 ( $5 f^{7} 7 s^{2}$ ), Cm 96 ( $5 f^{7} 6 d^{1} 7 s^{2}$ ), Bk 97 ( $5 f^{9} 7 s^{2}$ ). Which ions have the $5 f^{7}$ configuration?

A $Cm X^{3 +}$
B $Bk X^{4 +}$
C $Bk X^{3 +}$
D $Am X^{3 +}$

Answer: A, B

Cm X^{3 +}

loses

7 s^{2}

and

6 d^{1}

, leaving

5 f^{7}

.

Bk X^{4 +}

loses

7 s^{2}

and two

5 f

electrons (

5 f^{9} \to 5 f^{7}

).

Am X^{3 +}

is

5 f^{6}

and

Bk X^{3 +}

is

5 f^{8}

.

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